Code
P0600
AUDI
P — Powertrain
Defective PCM (Power Train Control Module), Defective PCM data bus wiring/connections, Defective PCM data bus ground circuit(s), Defective PCM or other control module controlled output devices, Defective CAN bus communication
Views:
UK: 24
EN: 35
RU: 55
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
Similar codes
Workshop Manuals
Repair manuals for AUDI
11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
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Code
P0600
Generic
P — Powertrain
Serial Communication Link
Views:
UK: 25
EN: 38
RU: 57
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
P0600
GWM
P — Powertrain
- Communication failure
Views:
UK: 2
EN: 10
RU: 12
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
Similar codes
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Code
P0600
HUMMER
P — Powertrain
Serial Communication Link Malfunction
Views:
UK: 11
EN: 26
RU: 40
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
Similar codes
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Code
P0600
LAND ROVER
P — Powertrain
Serial Communication Link
Views:
UK: 7
EN: 16
RU: 34
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
P0600
MERCEDES-BENZ
P — Powertrain
Serial Communication Link Malfunction
Views:
UK: 13
EN: 28
RU: 50
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
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Code
P0600
MITSUBISHI
P — Powertrain
Serial communication link
Views:
UK: 10
EN: 26
RU: 40
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
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Code
P0600
SEAT
P — Powertrain
PCM - no serial data
Views:
UK: 1
EN: 8
RU: 14
AI status
Completed
Completed
100%
Causes
- Failed or intermittent PCM (ECM) module
- Open, shorted or corroded CAN/data-bus wiring or connectors
- Faulty or missing CAN bus termination resistor(s)
- Poor or open ground(s) for PCM or other network modules
- Blown fuse or loss of supply voltage to PCM or bus power feed
- Another module dragging the bus off-line (bus-off condition)
Symptoms
- MIL (check engine light) illuminated
- Loss of communication with PCM on diagnostic scanner
- Intermittent or no engine/crank/no-start conditions
- Transmission shifting abnormalities (if TCM communication affected)
- Loss of instrument cluster data (speedometer, warning lights)
- Disabled systems that rely on network messages (cruise control, ABS alerts)
What to check
- Obtain full freeze frame and stored DTC list; note U-codes or other module faults
- Verify battery voltage stable (>12.4 V) and charge; check main power fuses to PCM
- Visually inspect PCM and CAN wiring harness, connectors and grounds for damage or corrosion
- Check continuity/resistance between CANH and CANL termination points (expect ~60 ohms across CANH–CANL with harness disconnected at both ends)
- Probe CANH and CANL at PCM with key ON and engine OFF; verify idle voltages and presence of traffic with a scan tool or scope
- Disconnect suspected modules one at a time (or isolate network segments) to identify a bus-off node
Signal parameters
- Typical high-speed CAN recessive voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (values vary by manufacturer)
- Dominant state voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2 V when active)
- Expected DC resistance between CANH and CANL (terminals at vehicle ends): ≈ 60 ohms (two 120 Ω terminators in parallel)
- Bus data rate commonly 250 kb/s or 500 kb/s for powertrain networks; scanner should show traffic if network healthy
Diagnostic algorithm
- Read and record all stored DTCs (including U-codes) and freeze frame data. Attempt to communicate with PCM using OEM or advanced scan tool.
- Verify battery voltage and main power fuses to PCM; repair any blown fuses and recheck communication.
- Perform a visual inspection of PCM connectors, pins and CAN harness routing for damage, corrosion, or water ingress; repair as required.
- Check PCM ground circuits for continuity to chassis and battery negative; repair high-resistance or open grounds.
- With ignition ON, measure CANH and CANL at the PCM connector: confirm expected idle voltages and that the lines are not shorted to battery or ground.
- Use a scan tool or oscilloscope to confirm CAN traffic. If no traffic, measure voltage across CANH–CANL (expect ≈60 ohms). If shorted or open, trace wiring and disconnect modules to isolate the fault.
- If bus shows excessive errors or a bus-off condition, disconnect modules one at a time (or unplug suspect connectors) to find the failing node causing bus errors.
- Inspect for aftermarket electronics that tap the CAN bus; temporarily remove them and retest.
- If wiring and all other modules test good and reprogramming is current, consider reflashing PCM software per OEM procedures. Replace PCM only after wiring/system faults are ruled out.
- After repair, clear DTCs and verify proper communication, then road-test and re-scan to confirm issue resolved.
Likely causes
- Damaged CANH/CANL wiring (chafed, pinched or short to battery/ground)
- Open or high-resistance ground at the PCM
- Missing or failed 120 ohm termination resistors (end of line)
- Failed PCM internal transceiver or processor fault
- Loose, corroded or pushed-out connector pin at PCM or module
Fault status
Status
Serial communication link malfunction — PCM not communicating on vehicle data bus (CAN).
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
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